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Concentratlon (PPB) <br /> O O O O O O O O <br /> 820/1997 . <br /> 10/20/1997 <br /> 12/2011997 <br /> 212011998 <br /> 420/1998 <br /> 6/20/1998 - <br /> 812011998 <br /> 20/1998812011998 <br /> 10/20/1998 <br /> 12/20/1998 <br /> 212011999 - <br /> 4120/1999 - <br /> 6120/1999 <br /> 120/19994120/1999620/1999 <br /> 8/20/1999 - <br /> 1012011999 <br /> co <br /> 122011999 y <br /> ?1202000 0 <br /> O <br /> 4/202000 <br /> cs <br /> 620/2000 <br /> 8202000 O <br /> 10202000o� 0 <br /> 12202000 r' <br /> 220200'1 <br /> co <br /> 4/202001 <br /> co <br /> CD <br /> 6202001 <br /> rn <br /> CD �- <br /> 8202001 0 <br /> 10202001 <br /> 12202001 <br /> 2202002 <br /> 4202002 <br /> 6/20/2002 - <br /> 8/20/2002 - <br /> 10/20/2002 <br /> 202002820200210202002 <br /> 121202002 <br /> 212012003 - <br /> 4/20/2003 - <br /> 6/=003 <br /> 20200342020036202003 <br /> 820/2003 <br /> ` s <br /> 10202003 ,. <br />